brantgoose:I think I read some where that kangaroo guts do not contain methane-producing bacteria. So I see no reason why camels might not be methane-free.

Not CO2 free, of course. Or water-free. But the point is moot.

I go read now.

And this is why this is a study worth performing. We have a good grasp on most of the carbon and methane cycle, but we can reduce the error bars the more we know. Plus, there are some movements afoot to try to move to camel meat and milk as a more environmentally friendly substitute for cows. If they produce as much methane as cows, or less methane but more on a pound of meat/liter of milk basis, it's not worth it.

It might be carbon neutral but methane is about 1000x more IR-active than CO2 so converting CO2 to CH4 would actually make things worse - although it's obviously very dependent on just how much CO2 is being converted to CH4.